Hi everyone - first off, sorry if I'm repeating what's already been said, I don't have time to read the thread yet, but I will later on!!
So just a quick thought -
a neighbour said she'd seen him playing in the stairwell often, of the flats where he lived, could he have got out of his flat and then not been able to get out of the main door of the complex, and someone within the block took him? that's the only option I can see if he left by his own volition, very unlikely... I can't see him choosing to go out in to the cold and dark. Makes no sense.
Also I read on daily mirror live updates, that dad was not there that night or morning, yet dad does apparently live with the family so where was he?
I would want to know how many bedrooms there are in the flat, because you'd think his siblings might notice him getting up if they were in the same room.
Where is his coat and shoes normally kept also?